How is load balancing in big systems implemented?

Posted by uther-lightbringer on Stack Overflow See other posts from Stack Overflow or by uther-lightbringer
Published on 2010-05-23T23:00:49Z Indexed on 2010/05/23 23:31 UTC
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algorithm

Hello, I'm wondering how is implemented load balancing in realy big applications like google or facebook. I know that in normal scenario there may be machine dedicated to this task, but I would like to know how is it resolved in realy big aplication with hundreds of thousans people accessing it in any given time. I am just wondering how exactly when one types google.com will that request find its way to concrete computer (are there multiple load balancers? and how is it set up and implemented that user's request will find the way to concrete balancer out of many others). I will realy appreciate if someone enlightens me this issue, thank you.

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